My friends and I are 4 years experienced hikers, and next year we want to go for a 5000 m (16,400 ft) mountain. What are the best options regarding the complexity of the trail and how beautiful the view is? We live in Germany, Munich.
The first thing that comes to mind to me is Kilimanjaro. It's almost 6,000m and my evaluation of it would be class 2 (I haven't seen any proper rating of it) and that only on the final ascent, getting there was easy (except for the altitude) class 1 trail.
You have far more experience than I did when I tackled it. We didn't manage to summit because of the ice--no big deal by night, glacier equipment required by day and we had neither the equipment nor the training for that. We were too slow, the sun caught us just short of the secondary summit and we basically crawled the last little distance to it. More recent pictures show that global warming has done major changes, I don't know if the ice is still a problem or not. Without that problem I'm sure the two of us that didn't turn back from the altitude or cold would have made the summit.
Edit: I didn't realize the grading wasn't universal.
Do the Everest base camp and Kalapathar trek in Nepal. The maximum elevation you gain on this trek is 5,545m at Kalapathar and maximum elevation for overnight at 5,100m. No previous experience of trekking is required but you should be moderately fit and adaptable to high altitude and continue walking for 13 days.